Abstract
<p>There has been considerable development of seismic detectors over the last 80 years. However, there is still a need to further develop new earthquake exploration and data acquisition systems with high precision. In particular, for China to keep up with the latest technology of these systems, it is important to be involved in the research and development, instead of importing systems that soon fall behind the latest technology. In this study, the features of system-on-a-programmable-chip (SoPC) technology are analyzed and used to design a new digital seismic-data acquisition station. The hardware circuit of the station was developed, and the analog board and the main control data-transmission board were designed according to the needs of digital seismic-data acquisition stations. High-definition analog-to-digital converter sequential digital filter technology of the station (cascade integrator comb filter, finite impulse response digital filter) were incorporated to provide advantages to the acquisition station, such as high definition, large dynamic scope, and low noise. A specific data-transmission protocol was designed for the station, which ensured a transmission speed of 16 Mbps along a 55-m wire with low power consumption. Synchronic acquisition was researched and developed, so as to achieve accuracy better than 200 ns. The key technologies were integrated into the SoPC of the main control data-transmission board, so as to ensure high-resolution acquisition of the station, while improving the accuracy of the synchronic acquisition and data-transmission speed, lowering the power consumption, and preparing for the follow-up efforts to tape out.</p>
Highlights
In over the last 80 years, the development of seismic exploration instruments has gone through five stages: the electron tube, transistors, conventional digital seismographs, 16-bit telemetry seismography, and 24-bit telemetry seismography
A cable-less connection for this was achieved with FireFly, which significantly reduces the transportation costs in the field
The data-acquisition station that we developed has the following features: (1) high-resolution analogto-digital conversion, and subsequent cascade integrator comb (CIC), finite impulse response (FIR), and infinite impulse response (IIR) digital filters, which are suitable for geophysical data acquisition; and (2) data-acquisition station core technology integrated into a single-chip SoPC
Summary
In over the last 80 years, the development of seismic exploration instruments has gone through five stages: the electron tube (optical spot recorders), transistors (analog tape recorders), conventional digital seismographs (digital tape recorders), 16-bit telemetry seismography, and 24-bit telemetry seismography [Song et al 2012]. Jilin University used an ethernet relay solution to achieve a single station 8-channel seismic-data acquisition and recording system, with a transmission distance of 100 m, and a transfer rate of 16 Mbps. The data-acquisition station that we developed has the following features: (1) high-resolution analogto-digital conversion, and subsequent CIC, FIR, and IIR digital filters, which are suitable for geophysical data acquisition; and (2) data-acquisition station core technology integrated into a single-chip SoPC. After industrialization, this can be customized into a monolithic integrated chip, for which independent intellectual property rights can be obtained. Key technologies of the new telemetric digital seismic-data acquisition station
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